Not Deere related (maybe a little). I have a Farmhand F11 loader on a JD620. The loader does not stay put but slowly creeps down. I think I need a new set of control valves. They also leak. What do you mean by open and closed center? What type of setup would I need? Thanks for your help.

Thanks for the reply. Now I have more things to consider. The loader is run off a pto pump. I assume I would want "open center". I also probably want double acting. What are load check valves, metering grooves and internal relief? I have seen adjustable pressure relief valves (1500-3000 psi). Is there a site somewhere that explains these basic issues?

-load checks are required for lifting and holding, otherwise when attempting to re-lift a load, the loader will drop slightly before the hydraulics catches up.-double acting means your loader will power downwards as well as upwards. If you can lift the frt. wheels off of the ground, its double acting. Another thing to tell by is if it has one or two hoses to each cylinder. One hose to each cylinder means its single acting.-metering grooves allow you to slowly move the boom or bucket if you slightly move the lever.-internal relief is simply that. A relief valve that should open before "loader damage" from over stress (pressure)occurs.

-load checks are required for lifting and holding, otherwise when attempting to re-lift a load, the loader will drop slightly before the hydraulics catches up.-double acting means your loader will power downwards as well as upwards. If you can lift the frt. wheels off of the ground, its double acting. Another thing to tell by is if it has one or two hoses to each cylinder. One hose to each cylinder means its single acting.-metering grooves allow you to slowly move the boom or bucket if you slightly move the lever.-internal relief is simply that. A relief valve that should open before "loader damage" from over stress (pressure)occurs.

Thanks for the information. It really does help. Based on your information, my current setup has double acting, metering grooves and load checks. Now I know what to look for in a replacement. Thanks again.

Probably, the main thing is if it is going on a new generation or newer tractor it has to be closed center. Many valves can be adapted to closed center. Northern Tool has lots of hydraulic valves as does Surplus Hydraulics. Both have internet sites.

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